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Locked posts can be edited by any moderator. The general plan is you can always flag the post for moderator attention, and explain that the tag needs removal. You can flag a locked post. Failing that, a Meta post is an option if there's a lot, but in general flagging is sufficient.

Blacklisting ninja seems not too necessary. With a lack of precedent, it's unlikely that it will spring up again. Blacklisting is more for things which we expect continual problems with.